Alekhine Defense: Krejcik Variation: what should Black play?

In the Alekhine Defense: Krejcik Variation, Black faces immediate pressure against the f7 square from the White c4 and g5. The most effective response for Black is O-O, which secures the king and prepares to challenge the advanced knight. This move is played in 68.1% of recorded games and maintains a near-equal engine evaluation of -0.25.

The defensive priority of O-O

The move O-O is the primary choice in this position, appearing in 344,000 recorded games. By castling, Black removes the immediate threat of a sacrifice on f7 and prepares to drive the White g5 back with a subsequent pawn push. The main line continues O-O d4 h6 Nf3 Nxe4 Nxe4, where Black successfully exchanges pieces to neutralize White's early aggression.

Solidifying with e6

The second most popular continuation is e6, chosen in 26.2% of games (132,000 instances). This move directly blocks the diagonal of the c4, providing a solid defensive structure at the cost of slightly restricting the light-squared bishop. The engine evaluates this as nearly equal at -0.11, often leading to the sequence e6 O-O O-O d4 Nc6 Bb5.

Risks of d5 and other alternatives

Attempting to strike the center immediately with d5 is significantly less common, played in only 0.7% of games. While it challenges the c4, it allows White to gain an advantage of +0.53 following d5 exd5 O-O d3 c6 dxc6. More passive or unconventional moves, such as Rf8 or Qd7, are statistically rare and generally considered inferior, with Qd7 resulting in a severe +3.10 evaluation due to the tactical vulnerability of the e8.